| T.R | Title | User | Personal
Name | Date | Lines |
|---|
| 478.1 | Can't dismount a system disk | GIDDAY::GILLINGS | a crucible of informative mistakes | Sun Mar 03 1996 16:00 | 5 |
| 478.2 | Need to take the disk offline | COOKIE::AMEND | | Mon Mar 04 1996 08:25 | 17 |
| 478.3 | defrag shadowed system disk | KAOFS::B_CROOK | Brian @KAO | Wed Mar 26 1997 10:05 | 13 |
| WRT defragging a system disk, I have the following config:
4 node cluster, all running VMS V5.5-2
single (shared) system disk is 2 member shadow set
TA86 tape drive is available
SAB is available
a minimum of downtime on the cluster is available
what is the fastest/bestest way for me to defrag the system disk?
(If I need to split the system disk shadow set to perform the defrag,
how do I do that?)
thanks,
Brian
|
| 478.4 | To defragment INDEXF.SYS might have to do a backup restore | COOKIE::AMEND | | Thu Mar 27 1997 10:33 | 45 |
| Brian
I am not sure what you you want to do: defragment the disk or
just defragment INDEXF.SYS. You can defragment the system disk
as you would any other disk. However, if you want to
defragment INDEXF.SYS that is problem. I do not know all of
the ins and outs of shadow sets, especially system disks in
shadow sets. I just talked to our system manager about doing
it and he did not think it was very easy to do either.
How bad is your INDEXF.SYS fragmented? It may not be worth the
trouble.
The system managers suggestion would be to boot up standalone
backup and do a backup to your TA86 and then restore it. He
said this would take about 2 hours.
I was going to suggest something like:
Boot up on disk 1 without disk 2
Defragment disk 2
Boot up on disk 2
bring disk 1 into the shadow set
However, I have no idea how to do this with a system
shadow set.
For a none system shadow set, you can do the following:
1. Dismount both members of the shadow set
2. Mount one of the physical disk volumes with
/OVERRIDE=SHADOW and then dismount it before doing the
defragmentation.
3. Defragment the INDEXF.SYS on the disk volume.
4. Mount the disk volume into the shadow set.
5. Add the disk volume that not defragmented into the shadow
set.
thanks
jim amend
|
| 478.5 | | KAOFS::B_CROOK | Brian @KAO | Thu Mar 27 1997 11:57 | 13 |
| thanks for the reply Jim,
I did want to defrag the whole disk. The DEC File Optimizer
(V1.1-A) reports it with a 50% fragmentation index (20% free space and
30% file) I can't seem to get it much better than that due to the many
open files on the disk. Downtime is a rare thing so I am trying to take
maximum advantage of a downtime window that I do have coming up.
The system disk has about 2,600,000 block in use (RA73) and I don't
think I can get it to tape and back in 2 hours? I was hoping to get a
method of splitting the shadow set and doing disk to disk and for that
reason, I like your 3rd option/method in .3.
|